Painting2025-11-05

Complete Interior Painting Guide

Professional start-to-finish guide for interior painting projects.

Typical Project Timeline

Day 1: Prep (4-6 hours) - Cleaning, taping, patching, priming

Day 2: First coat (3-4 hours) - Cutting in and rolling

Day 3: Second coat (3-4 hours) - Final coat and cleanup

Total: 2-3 days for average room (200 sq ft walls). Add 1 day for dark-to-light changes.

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Essential Tools

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Phase 1: Planning & Materials

1Calculate Materials

Measure room dimensions and calculate paint requirements before shopping.

What You Need:

  • • Wall area (length × height of each wall)
  • • Subtract doors and windows
  • • Account for texture (+30-40% if textured)
  • • Add 10% waste factor
  • Use our calculator →

2Select Paint & Sheen

Living Areas

  • • Walls: Eggshell or satin
  • • Trim: Semi-gloss
  • • Ceiling: Flat

Bathrooms/Kitchens

  • • Walls: Satin or semi-gloss
  • • Trim: Semi-gloss
  • • Ceiling: Satin (moisture areas)

Complete sheen guide →

3Determine Primer Needs

Always Prime:

New drywall, bare wood, stains, dark-to-light color changes

Spot-Prime:

Patched areas, repairs (prevents dull spots)

Skip Primer:

Previously painted walls in good condition, similar color

Complete primer guide →

4Gather Tools & Supplies

Essential Tools:

  • ✓ 9" roller frame & covers
  • ✓ Paint tray & liner
  • ✓ 2" angled brush
  • ✓ Painter's tape (blue or green)
  • ✓ Drop cloths
  • ✓ Ladder/step stool
  • ✓ Spackle & putty knife
  • ✓ Sandpaper (220-grit)

Helpful Extras:

  • • Extension pole for roller
  • • Edger tool (for beginners)
  • • Paint can opener
  • • Stir sticks
  • • Rags & cleaning supplies
  • • TSP cleaner

Phase 2: Surface Preparation

Critical: Prep is 70% of a Quality Paint Job

Professional painters spend more time on prep than actual painting. Rushing prep guarantees poor results.

Step 1: Clear the Room

  • • Remove all furniture if possible
  • • Move remaining furniture to center and cover with plastic
  • • Remove outlet covers and switch plates
  • • Take down curtains, rods, pictures, nails

Step 2: Repair & Patch

Fill Holes & Cracks

  • • Nail holes: Spackle or lightweight compound
  • • Cracks: Joint compound
  • • Large holes: Patch kit + joint compound
  • • Let dry completely (2-4 hours minimum)

Sand Repairs

  • • 220-grit sandpaper for spackle/compound
  • • Sand until flush with wall surface
  • • Wipe dust with damp cloth

Step 3: Clean Walls

Paint adheres poorly to dirty, greasy surfaces. Clean walls ensure proper adhesion.

Cleaning Process:

  • 1. Mix TSP solution (1/4 cup per gallon warm water)
  • 2. Wash walls from bottom to top (prevents streaking)
  • 3. Rinse with clean water
  • 4. Let dry 24 hours before painting

Alternative: For lightly soiled walls, use mild dish soap solution or deglosser.

Step 4: Tape & Protect

Taping Technique:

  • • Use painter's tape (blue or green)
  • • Press edges firmly to prevent bleed-under
  • • Tape baseboards, trim, ceiling line
  • • Don't leave tape on more than 7 days

Protection:

  • • Canvas drop cloths (not plastic - slippery)
  • • Plastic sheeting for furniture
  • • Cover floors completely
  • • Tape plastic over doorways to contain dust

Phase 3: Priming (If Needed)

Primer Application

1. Tint the primer - Ask paint store to tint to 50% of final color (for dark-to-light) or gray

2. Cut in edges - Use 2" brush on corners, ceiling line, trim (3" band)

3. Roll walls - Use appropriate nap roller for texture. Work in 4'×4' sections

4. One coat sufficient - Unless covering severe stains (may need 2 coats)

5. Dry time - Wait 2-4 hours minimum before topcoat (check label)

Phase 4: Painting

Paint Application Sequence

1

Ceiling First

Paint ceiling before walls. Drips and overspray land on unpainted walls.

2

Walls Second

Do all wall coats before touching trim. Easier to tape over dried wall paint.

3

Trim Last

Baseboards, door frames, window trim. Use semi-gloss. Remove tape after trim dries.

Professional Painting Technique

Cutting In (Brush Work)

  • • Load brush 1/3 of bristle length
  • • Start 2-3 inches from edge, brush toward edge
  • • Create 3-4 inch wide band
  • • Work in sections - keep wet edge
  • • Cut in entire room before rolling (for consistency)

Rolling Technique

  • • Load roller evenly - don't oversaturate
  • • Roll in "W" pattern for even distribution
  • • Work in 4' × 4' sections
  • • Roll into wet cut-in edges (blend)
  • • Don't press too hard - causes drips
  • • Finish each section before moving to next

Pro Tip: Maintain a "wet edge" - always roll into area you just painted while it's still wet. Prevents lap marks.

Coat Timing & Requirements

Dry time between coats:2-4 hours (check label)
Number of coats needed:2 coats standard
Full cure time:30 days
Light use:24 hours after final coat

Second Coat Decision: If primer-tinted properly and using quality paint, 2 coats should suffice. 3 coats needed if skipped primer or covering very dark colors.

Phase 5: Finishing & Cleanup

Removing Tape Properly

Critical Timing!

Remove tape when paint is dry to touch but not fully cured (1-2 hours after final coat). Too early = smears. Too late = paint peels off with tape.

• Pull tape at 45-degree angle

• Pull slowly and steadily

• Use razor blade to score if paint has dried

• Touch up any gaps with small brush

Final Inspection & Touch-ups

  • • Inspect walls in natural daylight - check for missed spots
  • • Look at walls from multiple angles - oblique light shows defects
  • • Touch up any holidays (missed spots) with roller or brush
  • • Check corners and edges carefully
  • • Verify outlet covers fit properly before reinstalling

Cleanup & Storage

Cleanup:

  • • Wash brushes/rollers immediately
  • • Soap & water for latex paint
  • • Mineral spirits for oil-based
  • • Remove drop cloths carefully

Paint Storage:

  • • Seal can tightly (hammer rim flat)
  • • Store upside down (creates seal)
  • • Label with room name & date
  • • Keep for future touch-ups

Common Mistakes to Avoid

❌ Don't Do This:

Skipping prep work

Poor prep = poor results. Always.

Using cheap paint

Requires 3-4 coats. Buy quality paint.

Not enough paint

Running out mid-project causes lap marks.

Wrong roller nap

Smooth roller on texture leaves voids.

Painting too fast

Rushing causes drips, runs, and holidays.

✓ Do This Instead:

Spend time on prep

70% prep, 30% painting = professional results.

Invest in quality paint

2 coats quality greater than 4 coats cheap.

Calculate accurately

Use calculator. Add 10% waste factor.

Match roller to texture

Thicker texture = thicker nap.

Work methodically

Slow, consistent strokes. Maintain wet edge.

Cost Estimate: 12' × 14' Bedroom

Paint (3 gallons @ $45):$135
Primer (1 gallon):$25
Supplies (tape, brushes, rollers):$40
Total Materials:$200

Professional painter: $400-600 for same room (labor + materials). DIY saves $200-400.